Knock Out Drench

This is when you use a drench that has an active (the thing that kills the worms) that is not in your other drenches so it is able to kill worms that your ‘normal’ drench can’t.  This slows the development of drench resistance to your routine of ‘normal’ drenches.  

Autumn is a good time to get the most impact from a Knock Out drench.